include/linux/genetlink.h

   1 #ifndef __LINUX_GENERIC_NETLINK_H
   2 #define __LINUX_GENERIC_NETLINK_H
   3
   4 #include <uapi/linux/genetlink.h>
   5
   6
   7 /* All generic netlink requests are serialized by a global lock.  */
   8 extern void genl_lock(void);
   9 extern void genl_unlock(void);
  10 #ifdef CONFIG_LOCKDEP
  11 extern int lockdep_genl_is_held(void);
  12 #endif
  13
  14 /* for synchronisation between af_netlink and genetlink */
  15 extern atomic_t genl_sk_destructing_cnt;
  16 extern wait_queue_head_t genl_sk_destructing_waitq;
  17
  18 /**
  19  * rcu_dereference_genl - rcu_dereference with debug checking
  20  * @p: The pointer to read, prior to dereferencing
  21  *
  22  * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
  23  * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
  24  */
  25 #define rcu_dereference_genl(p)                                 \
  26         rcu_dereference_check(p, lockdep_genl_is_held())
  27
  28 /**
  29  * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
  30  * @p: The pointer to read, prior to dereferencing
  31  *
  32  * Return the value of the specified RCU-protected pointer, but omit
  33  * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
  34  * caller holds genl mutex.
  35  */
  36 #define genl_dereference(p)                                     \
  37         rcu_dereference_protected(p, lockdep_genl_is_held())
  38
  39 #define MODULE_ALIAS_GENL_FAMILY(family)\
  40  MODULE_ALIAS_NET_PF_PROTO_NAME(PF_NETLINK, NETLINK_GENERIC, "-family-" family)
  41
  42 #endif  /* __LINUX_GENERIC_NETLINK_H */